User`s guide

120 53220A/53230A User’s Guide
4 53220A/53230A Input Signal Conditioning
Channel Characteristics
There are two, plus an optional third input channel on the 53220A/53230A
counter. Product Option 201 adds parallel (additional) rear panel access to
channels 1 and 2. Product Options 106 and 115 add a 6 GHz or 15 GHz third
channel. Option 202 places third channel Option 106 / 115 on the front panel
and Option 203 places the third channel option on the rear panel.
When programming the counters from an I/O interface, configuration is pro-
vided by commands within the SCPI INPut subsystem. Within the SCPI com-
mands, INPut[{1|2}] in the syntax refers to input channels 1 and 2. As
such, these commands do not apply to third channel Option 106 or 115.
The counter channels with the exception of frequency ratio and selected time
interval measurements are separate and can be configured independently.
Measurements on the channels do not occur simultaneously, however. Switch-
ing between channels retains the channel configuration, but ends the current
measurement. The newly selected channel is re-initiated and measurements
begin when the programmed trigger conditions are met.
Signal Conditioning Path
Figure 4-1 represents the counter’s signal conditioning path.
NOTE
If parallel channel 1 and channel 2 inputs are present on the rear panel (Option 201), all
input specifications apply to the rear terminals only, and are relative to 50
Ω input
impedance. Performance of the front panel inputs in this instance is not specified. Also,
when calibrating the instrument, the rear panel input terminals are used.